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DE19952782A1 - System to reduce aerosol formation in liquid fuel in common-rail IC engines has heat exchanger with guide elements to cool fuel flowing back to tank and to reduce aerosol - Google Patents

System to reduce aerosol formation in liquid fuel in common-rail IC engines has heat exchanger with guide elements to cool fuel flowing back to tank and to reduce aerosol

Info

Publication number
DE19952782A1
DE19952782A1 DE19952782A DE19952782A DE19952782A1 DE 19952782 A1 DE19952782 A1 DE 19952782A1 DE 19952782 A DE19952782 A DE 19952782A DE 19952782 A DE19952782 A DE 19952782A DE 19952782 A1 DE19952782 A1 DE 19952782A1
Authority
DE
Germany
Prior art keywords
heat exchanger
fuel
vehicle
guide elements
holding device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19952782A
Other languages
German (de)
Other versions
DE19952782C2 (en
Inventor
Achim Koehler
Christoph Bunse
Lothar Mauz
Hans Hermann Keller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Priority to DE19952782A priority Critical patent/DE19952782C2/en
Publication of DE19952782A1 publication Critical patent/DE19952782A1/en
Application granted granted Critical
Publication of DE19952782C2 publication Critical patent/DE19952782C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/18—Arrangements or mounting of liquid-to-air heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/20—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03328—Arrangements or special measures related to fuel tanks or fuel handling
    • B60K2015/03414—Arrangements or special measures related to fuel tanks or fuel handling associated with the fuel tank for cooling heated fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/10—Fuel manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/007—Layout or arrangement of systems for feeding fuel characterised by its use in vehicles, in stationary plants or in small engines, e.g. hand held tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The fuel volume not required for operation of the IC engine, dependent upon the engine load condition, is returned to the fuel system after passing through a heat exchanger (16). The heat exchanger contains several parallel conductor elements (16a) of a material with good heat-conducting characteristics. It is fastened in a holder unit (13) with air guide elements (20) in a motor vehicle. The guide elements are NACA jets, and are formed so that when the vehicle is moving, a large air volume (A,B) flows at high speed around at least some parts of the heat exchanger.

Description

Die Erfindung betrifft ein System zur Reduzierung bzw. Abbau eines Aerosols in einem in einer Kraftstoffspei­ chereinheit in seinem flüssigen Aggregatzustand ent­ haltenen Kraftstoff.The invention relates to a system for reducing or Degradation of an aerosol in a fuel tank unit in its liquid state holding fuel.

Bei nach dem Common-Rail-Prinzip betriebenen Diesel­ brennkraftmaschinen ist es aus der Praxis bekannt, daß bei höheren Common-Rail-Kraftstoff-Drücken durch die Druckentspannung im Druckreduzierungsventil eine Aero­ sol-Bildung auftritt. Das Aerosol sind feine Luftbläs­ chen, die durch die Kraftstoffrücklaufleitung in die Kraftstoffspeichereinheit befördert werden. Unter be­ stimmten äußeren Randbedingungen, wie z. B. dem aktuell vorliegenden thermodynamischen Zustand des Kraft­ stoffs, wie z. B. der Temperatur, verursachen die in der Kraftstoffspeichereinheit ausperlenden Bläschen eine verstärkte Nebelbildung.For diesel operated according to the common rail principle internal combustion engines it is known from practice that at higher common rail fuel pressures by the Pressure relief in the pressure reducing valve an aero sol formation occurs. The aerosol are fine air bubbles Chen through the fuel return line in the Fuel storage unit are transported. Under be agreed external boundary conditions such. B. the current present thermodynamic state of the force substance, such as B. the temperature, cause the in bubbles bubbling out of the fuel storage unit increased fog formation.

Der Nebel tritt bei der Betankung aus der Kraft­ stoffspeichereinheit aus. Für die die Betankung durch­ führende Person entsteht in nachteiliger Art und Weise eine Geruchsbelästigung.When refueling, the fog comes out of power  fabric storage unit. For the refueling through leading person arises in a disadvantageous way an unpleasant smell.

Ein weiteres, bei der Common-Rail Dieselbrennkraftma­ schine allgemein bekanntes Problem liegt in der star­ ken Erwärmung des von der Brennkraftmaschine nicht benötigten Kraftstoffs. Dieser Kraftstoff wird in der Rail auf einen sehr hohen Druck verdichtet. Nicht be­ nötigter Kraftstoff gelangt über das Druckreduzie­ rungsventil zurück zur Kraftstoffspeichereinheit. Der Kraftstoff wird während der Druckentspannung geschert und dadurch erwärmt. Das damit verbundene Termperatur­ problem in der Kraftstoffspeichereinheit hat es teil­ weise sogar erforderlich gemacht, auf Kraftstoffspei­ chereinheiten aus einem temperaturbeständigen Materi­ al. wie z. B. hoch termperaturfeste Kunststoffe, oder Metall zurückzugreifen.Another, at the common rail diesel engine Apparently common problem lies in the star ken heating of the internal combustion engine is not required fuel. This fuel is in the Rail compressed to a very high pressure. Not be the required fuel passes through the pressure reduction valve back to the fuel storage unit. The Fuel is sheared during pressure release and thereby warmed. The associated temperature problem in the fuel storage unit is part of it wise even required on fuel Units made of a temperature-resistant material al. such as B. high temperature resistant plastics, or Fall back on metal.

In der JP 2-218857 (A) und der JP 6-137230 (A) sind da­ her Kühleinrichtungen vorgeschlagen, welche zwischen den Einspritzdüsen einer Brennkraftmaschine und der Kraftstoffspeichereinheit angeordnet sind.JP 2-218857 (A) and JP 6-137230 (A) are there forth cooling devices proposed, which between the injectors of an internal combustion engine and the Fuel storage unit are arranged.

Es ist Aufgabe der Erfindung, ein System zu schaffen, welches das Aerosol in der Kraftstoffspeichereinheit zu verringern vermag.It is an object of the invention to provide a system which is the aerosol in the fuel storage unit is able to decrease.

Erfindungsgemäß wird diese Aufgabe durch die in An­ spruch 1 genannten Merkmale gelöst.According to the invention, this object is achieved by the in claim 1 resolved characteristics.

Bei Versuchen mit Kühleinrichtungen an Fahrzeugen mit einem Common-Rail-Dieselmotor hat sich den Erfindern in überraschender und unerwarteter Weise gezeigt, daß man über die spezielle erfindungsgemäße Ausgestaltung eines Wärmetauschers mit Halteeinrichtung und Luftleit­ elementen in der Lage ist, neben der Kühlung des zur Kraftstoffspeichereinheit zurückfließenden Kraftstoffs auch noch eine Reduzierung des Aerosols zu erreichen.In experiments with cooling devices on vehicles with a common rail diesel engine has become the inventor shown in a surprising and unexpected way that  one about the special embodiment according to the invention a heat exchanger with holding device and air duct is able to cool the unit Fuel storage unit flowing back fuel to achieve a reduction in aerosol.

Die Konzeption des erfindungsgemäßen Systems sieht dabei einen Wärmetauscher vor, welcher mehrere Lei­ tungselemente aus einem gut wärmeleitenden Material aufweist. Dabei ist der Wärmetauscher in oder an einer Halteeinrichtung in oder an einem mit der Brennkraft­ maschine versehenen Fahrzeug angebracht ist. Die Hal­ teeinrichtung weist dabei Luftleitelemente auf, so daß eine ideale Anströmung und damit eine sehr günstige Kühlung des Wärmetauschers, bzw. des durch ihn strö­ menden Kraftstoffs erreicht werden kann.The conception of the system according to the invention sees a heat exchanger in front of it, which has several lei tion elements made of a good heat-conducting material having. The heat exchanger is in or on one Holding device in or on one with the internal combustion engine machine provided vehicle is attached. The hal Teeinrichtung has air guiding elements so that an ideal flow and therefore a very cheap one Cooling the heat exchanger, or the flow through it fuel can be achieved.

Durch die in oder an der Halteeinrichtung angebrachte Einheit kann ein sehr günstiges, kleines und leicht zu handhabendes System verwirklicht werden, welches den Vorteil bietet, bei der Montage an dem Fahrzeug wenig Raum zu beanspruchen und leicht zu montieren zu sein.Through the attached in or on the holding device Unity can be a very cheap, small and easy too handling system can be realized, which the Has little advantage when mounting on the vehicle Take up space and be easy to assemble.

In einer besonders günstigen Ausführungsform der Er­ findung ist das Halteelement mit den Luftleitelementen und dem Wärmetauscher an einem Bereich des Unterbodens des Kraftfahrzeuges angebracht. Dies erlaubt eine sehr vorteilhafte Anströmung der Luftleitelemente durch den während der Fahrt an dem Unterboden entlangstreichen­ den Fahrtwind, ohne daß das System an dem Fahrzeug auffällige, optisch gegebenenfalls nachteilige Verän­ derungen erforderlich macht.In a particularly favorable embodiment of the Er is the holding element with the air guide elements and the heat exchanger on an area of the underbody attached to the motor vehicle. This allows a very advantageous flow of air through the brush along the underbody while driving the airstream without the system on the vehicle noticeable, optically possibly adverse changes changes required.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den weiteren Unteransprüchen und dem anhand der Zeichnungen nachfolgend beschriebenen Aus­ führungsbeispiel:Further advantageous embodiments of the invention  result from the further subclaims and the From the drawings described below example:

Es zeigt:It shows:

Fig. 1 ein Common-Rail-System in einer prinzipmäßigen Darstellung, mit einem erfindungsgemäßen Sy­ stem zur Reduzierung des Aerosols; Figure 1 shows a common rail system in a schematic representation, with a system according to the invention for reducing the aerosol.

Fig. 2 eine dreidimensionale Ansicht einer Ausfüh­ rungsform des erfindungsgemäßen Systems; und Fig. 2 is a three-dimensional view of an embodiment of the system according to the invention; and

Fig. 3 eine prinzipmäßige Schnittdarstellung gemäß der Linie III-III in Fig. 2. Fig. 3 shows a basic section according to the line III-III in Fig. 2.

In Fig. 1 ist eine schematische Prinzipdarstellung einer Common-Rail-Anlage erkennbar. Diese weist eine Kraftstoffspeichereinheit 1 bzw. einen Tank 1 mit ei­ nem Einfüllstutzen 1a zu seiner Betankung auf, welcher über ein Leitungselement 2 mit einem Kraftstoffilter 3, einer Vorförderpumpe 4 und einer Hochdruckpumpe 5 verbunden ist. Nachdem der Kraftstoff die genannten Elemente 3, 4, 5 durchlaufen hat, gelangt er über ein Leitungselement 6 in eine Rail 7.In Fig. 1 is a schematic diagrammatic representation of a common rail system is recognizable. This has a fuel storage unit 1 or a tank 1 with egg nem filler 1 a for its refueling, which is connected via a line element 2 to a fuel filter 3 , a prefeed pump 4 and a high pressure pump 5 . After the fuel has passed through the elements 3 , 4 , 5 mentioned , it reaches a rail 7 via a line element 6 .

Von der Rail 7 gelangt der auf einen hohen Druck ver­ dichtete Kraftstoff zu Injektoren 8. Von dem Injektor 8, in Fig. 1 ist nur einer der Injektoren 8 prinzipmä­ ßig dargestellt, gelangt der Kraftstoff in die Ver­ brennungsräume einer Brennkraftmaschine 9. Nicht benö­ tigter Kraftstoff gelangt über das Leitungselement 10 zu einem System zur Reduzierung des Aerosols 11. Von dort fließt der Kraftstoff über ein weiteres Leitungs­ element 12 zurück in die Kraftstoffspeichereinheit 1.From the rail 7 , the fuel compressed to a high pressure ver reaches injectors 8 . From the injector 8 , only one of the injectors 8 is shown in principle in FIG. 1, the fuel enters the combustion chambers of an internal combustion engine 9 . Unneeded fuel passes via the line element 10 to a system for reducing the aerosol 11 . From there, the fuel flows via a further line element 12 back into the fuel storage unit 1 .

Fig. 2 zeigt das System zur Reduzierung des Aerosols 11 in einer detaillierten dreidimensionalen Darstel­ lung. Das System 11 besteht dabei aus einer Halteein­ richtung 13, welche mehrere Befestigungspunkte 14 zur Befestigung der Halteeinrichtung 13 an einem Fahrzeug­ unterboden 15 (in Fig. 2 nicht erkennbar) aufweist. Weiterhin ist an bzw. in der Halteeinrichtung 13 ein Wärmetauscher 16 angebracht. Dieser Wärmetauscher 16 weist eine Einströmöffnung 17 auf, welche mit dem von der Rail 7 kommenden Leitungselement 10 in Verbindung steht. Eine Ausströmöffnung 18 des Wärmetauschers 16 steht dagegen mit dem Leitungselement 12 in Verbin­ dung, welches zurück zu dem Tank 1 führt. Fig. 2 shows the system for reducing the aerosol 11 in a detailed three-dimensional presen- tation. The system 11 consists of a holding device 13 , which has a plurality of fastening points 14 for fastening the holding device 13 to a vehicle underbody 15 (not visible in FIG. 2). Furthermore, a heat exchanger 16 is attached to or in the holding device 13 . This heat exchanger 16 has an inflow opening 17 which is connected to the line element 10 coming from the rail 7 . An outflow opening 18 of the heat exchanger 16 , on the other hand, is connected to the line element 12 , which leads back to the tank 1 .

In dem Wärmetauscher 16 sind mehrere parallel verlau­ fende Leitungselemente 16a aus gut wärmeleitendem Ma­ terial angeordnet, in denen der durch den Wärmetau­ scher 16 fließende Kraftstoff zirkuliert und von gemäß dem Pfeil A anströmender Luft gekühlt wird. Nach dem Passieren des Wärmetauschers 16 strömt die Luft gemäß den Pfeilen B durch zwei Luftaustrittsöffnungen 19 wieder aus der Halteeinrichtung 13.In the heat exchanger 16 , a plurality of parallel conduction elements 16 a made of highly heat-conducting material are arranged, in which the fuel flowing through the heat exchanger 16 is circulated and is cooled by air flowing in accordance with the arrow A. After passing through the heat exchanger 16 , the air flows out of the holding device 13 again according to the arrows B through two air outlet openings 19 .

Um ein besonders günstiges Anströmen des Wärmetau­ schers 16 durch die Luft gemäß dem Pfeil A zu errei­ chen, weist die Halteeinrichtung 13 Luftleitelemente 20 auf. Diese Luftleitelemente 20 sind hier in Form einer Düse ausgebildet und ermöglichen eine ideale Anströmung des Wärmetauschers 16 mit Luft. Dabei haben sich bezüglich der Verluste und des Anströmverhaltens optimierte Luftleitelemente 20 in Form einer NACA-Düse (NACA = National Advisory for Aeronautics) als beson­ ders günstig erwiesen.In order to achieve a particularly favorable flow towards the heat exchanger 16 by the air according to arrow A, the holding device 13 has air guiding elements 20 . These air guide elements 20 are designed here in the form of a nozzle and allow an ideal flow of air to the heat exchanger 16 . With regard to the losses and the flow behavior, optimized air guiding elements 20 in the form of a NACA nozzle (NACA = National Advisory for Aeronautics) have proven to be particularly favorable.

In Fig. 3 ist eine prinzipmäßige Schnittdarstellung gemäß der Linie III-III in Fig. 2 zu erkennen. Bei dieser Schnittdarstellung wird deutlich, daß die Hal­ teeinrichtung 13 mit dem Wärmetauscher 16 an dem prin­ zipmäßig angedeuteten Fahrzeugunterboden 15 befestigt werden kann. Durch die Luftleitelemente 20 bzw. die Naca-Düse 20 erfolgt eine annähernd ideale Anströmung des Wärmetauschers 16 durch die als Fahrtwind am Fahr­ zeugunterboden entlangströmende Luft, so daß über die Ausbildung der Luftleitelemente 20 erreicht werden kann, daß bei einer Bewegung des Fahrzeugs eine große Luftmenge mit hoher Geschwindigkeit den Wärmetauscher 16 umströmt und damit den in ihm befindlichen Kraft­ stoff kühlt. Der Wärmetauscher 16 bzw. die Leitungse­ lemente 16a des Wärmetauschers 16 weisen Lamellen 16b aus einem gut wärmeleitenden Material auf, welche die Abgabe von Wärme aufgrund der Vergrößerung der Ober­ fläche der Leitungselemente 16a durch die Lamellen 16b verbessern.In Fig. 3 shows a basic sectional view 2 according to the line III-III in Fig. Recognized. In this sectional view it is clear that the Hal teeinrichtung 13 can be attached to the heat exchanger 16 to the vehicle base 15 indicated in principle. Through the air guide elements 20 and the naca nozzle 20 there is an approximately ideal flow to the heat exchanger 16 through the air flowing under the vehicle underfloor as air, so that the formation of the air guide elements 20 can achieve that a large amount of air when the vehicle is moving flows around the heat exchanger 16 at high speed and thus cools the fuel in it. The heat exchanger 16 and the line elements 16 a of the heat exchanger 16 have fins 16 b made of a good heat-conducting material, which improve the emission of heat due to the increase in the upper surface of the line elements 16 a through the fins 16 b.

Es hat sich als besonders effektiv erwiesen, das Sy­ stem zur Reduzierung des Aerosols 11 im Fondbereich des Fahrzeugunterbodens 15 in Fahrtrichtung links an­ zuordnen, wobei für den Wärmetauscher 16 Aluminium als Material eingesetzt werden kann. Die Halteeinrichtung 13 kann aus verschiedenartigen Metallen oder aus Kunststoff gefertigt werden, wobei die Leitungselemen­ te 10, 12 im Bereich des Systems zur Reduzierung des Aerosols besonders günstig als NBR-Kraftstoffschläuche ausgeführt werden können.It has proven to be particularly effective to assign the system to reduce the aerosol 11 in the rear area of the vehicle underbody 15 in the direction of travel to the left, 16 aluminum being able to be used as the material for the heat exchanger. The holding device 13 can be made of different types of metal or plastic, with the line elements 10 , 12 in the area of the system for reducing the aerosol being particularly inexpensive as NBR fuel hoses.

Claims (9)

1. System zur Reduzierung des Aerosols in einem in einer Kraftstoffspeichereinheit (1) in seinem flüssigen Aggregatzustand enthaltenen Kraftstoff, wobei ein für den Betrieb einer nach dem Common- Rail-Prinzip arbeitenden Brennkraftmaschine (4), je nach Lastzustand der Brennkraftmaschine (4), nicht benötigter Anteil an Kraftstoff zurück zu der Kraftstoffspeichereinheit (1) gelangt, wobei der Kraftstoff wenigstens einen Wärmetauscher (16) durchfließt, welcher mehrere Leitungselemente (16a) aus einem gut wärmeleitenden Material auf­ weist, wobei der Wärmetauscher (16) in oder an ei­ ner Halteeinrichtung (13) in oder an einem mit der Brennkraftmaschine (4) versehenen Fahrzeug ange­ bracht ist, und wobei die Halteeinrichtung (13) Luftleitelemente (20) aufweist.1. System for reducing the aerosol in a fuel contained in a fuel storage unit ( 1 ) in its liquid state of aggregation, one for operating an internal combustion engine ( 4 ) operating according to the common rail principle, depending on the load condition of the internal combustion engine ( 4 ), Unused portion of fuel returns to the fuel storage unit ( 1 ), the fuel flowing through at least one heat exchanger ( 16 ), which has a plurality of line elements ( 16 a) made of a good heat-conducting material, the heat exchanger ( 16 ) in or on egg ner holding device ( 13 ) is placed in or on a vehicle provided with the internal combustion engine ( 4 ), and wherein the holding device ( 13 ) has air guiding elements ( 20 ). 2. System nach Anspruch 1, dadurch gekennzeichnet, daß die Luftleitelemente (20) in der Art ausgebildet sind, daß im Falle einer Bewegung des Fahrzeuges eine große Luftmenge (A, B) mit hoher Geschwindig­ keit zumindest Teile des Wärmetauschers (16) um­ strömt.2. System according to claim 1, characterized in that the air guide elements ( 20 ) are designed in such a way that in the event of movement of the vehicle a large amount of air (A, B) with high speed at least parts of the heat exchanger ( 16 ) flows around . 3. System nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Halteeinrichtung (13) in einem Außenbereich des Fahrzeuges angeordnet ist.3. System according to claim 1 or 2, characterized in that the holding device ( 13 ) is arranged in an outer region of the vehicle. 4. System nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Luftleitelemente (20) in der Art einer Düse ausgebildet sind.4. System according to claim 1, 2 or 3, characterized in that the air guide elements ( 20 ) are designed in the manner of a nozzle. 5. System nach Anspruch 4, dadurch gekennzeichnet, daß die Düse als NACA-Düse ausgebildet ist.5. System according to claim 4, characterized in that the nozzle is designed as a NACA nozzle. 6. System nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Leitungselemente (16a) des Wärmetauschers (16) wenigstens annähernd senkrecht zur Strömungsrich­ tung der sie umströmenden Luft angeordnet sind.6. System according to one of claims 1 to 5, characterized in that the line elements ( 16 a) of the heat exchanger ( 16 ) are arranged at least approximately perpendicular to the direction of flow of the air flowing around them. 7. System nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Leitungselemente (16a) des Wärmetauschers (16) in mehreren Lagen wenigstens annähernd parallel zueinander angeordnet sind.7. System according to one of claims 1 to 6, characterized in that the line elements ( 16 a) of the heat exchanger ( 16 ) are arranged in several layers at least approximately parallel to one another. 8. System nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Leitungselemente (16a) des Wärmetauschers (16) Lamellen (16b) aus einem gut wärmeleitenden Mate­ rial aufweisen. 8. System according to any one of claims 1 to 7, characterized in that the line elements ( 16 a) of the heat exchanger ( 16 ) fins ( 16 b) have a good heat-conducting material. 9. System nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Halteeinrichtung (13) im Bereich eines Unter­ bodens (15) des Fahrzeuges angeordnet ist.9. System according to any one of claims 1 to 8, characterized in that the holding device ( 13 ) is arranged in the region of an underbody ( 15 ) of the vehicle.
DE19952782A 1999-11-03 1999-11-03 System for reducing an aerosol Expired - Fee Related DE19952782C2 (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
DE10260775A1 (en) * 2002-12-23 2004-07-01 Daimlerchrysler Ag Fuel supply system for internal combustion engines with direct injection
FR2921435A1 (en) * 2007-09-20 2009-03-27 Renault Sas Fuel cooler arrangement for body of motor vehicle, has opening with portion for directing fresh air flow on fuel circuit i.e. radiator, and another portion for extracting cooled air from circuit when vehicle is in movement
DE102012001459A1 (en) * 2012-01-25 2013-07-25 Volkswagen Aktiengesellschaft Device for cooling heat generating element in operating chamber of motor vehicle by flow of fluid, comprises heat exchanger with fluid flow machine, which is arranged downstream such that outflow of fluid strikes on heat generating element
JP2016125429A (en) * 2015-01-06 2016-07-11 いすゞ自動車株式会社 Vehicle fuel cooling device
EP3300938A1 (en) * 2016-09-30 2018-04-04 Ford Global Technologies, LLC Motor vehicle underbody cladding with air inlet
EP3300995A1 (en) * 2016-09-30 2018-04-04 Ford Global Technologies, LLC Motor vehicle underbody cladding with air inlet
DE102016219035A1 (en) * 2016-09-30 2018-04-05 Ford Global Technologies, Llc Automotive underbody paneling with air intake
DE102016219033A1 (en) * 2016-09-30 2018-04-05 Ford Global Technologies, Llc Automotive underbody paneling with air intake

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10260775A1 (en) * 2002-12-23 2004-07-01 Daimlerchrysler Ag Fuel supply system for internal combustion engines with direct injection
US7201128B2 (en) 2002-12-23 2007-04-10 Daimlerchrysler Ag Fuel supply system for internal combustion engine with direct fuel injection
FR2921435A1 (en) * 2007-09-20 2009-03-27 Renault Sas Fuel cooler arrangement for body of motor vehicle, has opening with portion for directing fresh air flow on fuel circuit i.e. radiator, and another portion for extracting cooled air from circuit when vehicle is in movement
DE102012001459A1 (en) * 2012-01-25 2013-07-25 Volkswagen Aktiengesellschaft Device for cooling heat generating element in operating chamber of motor vehicle by flow of fluid, comprises heat exchanger with fluid flow machine, which is arranged downstream such that outflow of fluid strikes on heat generating element
JP2016125429A (en) * 2015-01-06 2016-07-11 いすゞ自動車株式会社 Vehicle fuel cooling device
EP3300938A1 (en) * 2016-09-30 2018-04-04 Ford Global Technologies, LLC Motor vehicle underbody cladding with air inlet
EP3300995A1 (en) * 2016-09-30 2018-04-04 Ford Global Technologies, LLC Motor vehicle underbody cladding with air inlet
DE102016219035A1 (en) * 2016-09-30 2018-04-05 Ford Global Technologies, Llc Automotive underbody paneling with air intake
DE102016219033A1 (en) * 2016-09-30 2018-04-05 Ford Global Technologies, Llc Automotive underbody paneling with air intake
CN107878182A (en) * 2016-09-30 2018-04-06 福特全球技术公司 Motor vehicle floor decorative panel with air inlet
US10189348B2 (en) 2016-09-30 2019-01-29 Ford Global Technologies, Llc Motor vehicle undertray trim panel having an air inlet
US10279677B2 (en) 2016-09-30 2019-05-07 Ford Global Technologies, Llc Motor vehicle undertray trim panel having an air inlet
CN107878182B (en) * 2016-09-30 2022-09-20 福特全球技术公司 Motor vehicle floor trim panel with air intake

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